Question

S

skilldust

Joined
Mar 13, 2007
Messages
278
I have been plate quenching ats-34 lately and they don't seem as hard as they were when I just air quenched. I don't have a hardness tester so I thought I would ask you guys.
I temper @ 375 for 2hrs x 1.
I would appreciate any and all comments-been worrying
about it.
Thanks a bunch, Jerry
 
Here is the recipe per Peters' Heat Treating. This is the same process for ATS-34 or CPM-154 / 154CM

"Our standard cycle is as follows: harden @ 1950F , soak at temp. for 30 minutes, quench w/ N2 down to room temp. We then go straight to the cryo w/ most orders( very delicate jobs may get a 300F temper prior to cryo), -300F/ 4hrs. The parts are allowed to return naturally to room temp., then we begin the tempering process. For ATS/154 this is 980-1020F for 2hrs. @ temp. X2 or maybe X3."
 
Plate quenching should give you at least the same hardness at air quench - and more likely a point or so higher.

Perhaps it just feels 'softer' because it's so much easier to finish without all the scale and oxides.

Rob!
 
I don't know, right now but it sure feels softer. I am making 2-4"dp hunters, one plate q. and air q. will take them to a local maker to have an rc run on them. Then I will know for sure.
Thanks a bunch guys
Jerry
 
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